Assessment of Flow Characteristics at Two Locations in an Energetic Tidal Channel
Assessment of Flow Characteristics at Two Locations in an Energetic Tidal Channel
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能量潮汐通道中两个位置的流动特性评估
DOI：
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发表时间：
2017
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通讯作者：
T. Whittaker
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作者：
Hanna Torrens;P. Schmitt;Carwyn Frost;I. Benson;P. Mackinnon;T. Whittaker
进流湍流会影响涡轮的动力性能和负载条件，也会影响尾迹恢复。在阵列尺度上，整个场地的流动条件的变化会影响涡轮机的能量产量、性能和负载条件。因此，了解调度点水流条件在时间和空间上的变化对潮流能行业具有重要意义。能够描述湍流特征的足够详细的潮汐流场数据仍然相对稀少。传统的三波束或四波束声学多普勒海流剖面仪(ADCP)通常用于潮流资源的表征，但它们受到时空分辨率和波束间流动均匀度假设的限制。因此，必须采用更高分辨率的测量方法。本文介绍了在Strangford Narrow的两个系泊平台上同时进行的水流测量。Strangford Narrow是一个充满活力的潮汐水道，相隔约500m。在这两个位置之间，河道内存在露头岩层，水流特性差异很大。使用两个配置的仪器来测量每个位置的流动特性：五射束ADCP(Nortek Signature 1000)和ADV(Nortek VECTOR)。本文比较和对比了不同仪器类型在各个位置的流动特性和湍流测量结果。仪表的组合可以改进流动的特征。潮流；声速测量；现场数据；湍流；流动特性
Inflow turbulence can impact a turbine’s power performance and load conditions and also affects wake recovery. At array scale, changes in flow conditions across a site impact the energy yield, performance and load conditions of turbines. Understanding the variation of flow conditions in time and space at deployment sites is therefore important to the tidal stream energy industry. Tidal flow field data of sufficient detail to allow turbulence characterisation remains relatively scarce. Traditional three or four beam Acoustic Doppler Current Profilers (ADCPs), which are commonly used for tidal flow resource characterisation, are limited by their spatial and temporal resolution and by the assumption of flow homogeneity across their beams. Higher resolution methods of measurement must therefore be implemented. This paper presents flow measurements that were conducted concurrently from two moored platforms in Strangford Narrows, an energetic tidal channel, separated by approximately 500m. Between the two locations a rocky outcrop exists in the channel and the characteristics of the flow vary significantly. Two collocated instruments were used to measure the flow characteristics at each location: a five beam ADCP (Nortek Signature 1000) and an ADV (Nortek Vector). This paper compares and contrasts both the flow characteristics at each location and the turbulence measurements using the different instrumentation types. The combination of instrumentation enables improved characterisation of the flow. Keywords— Tidal Stream; Acoustic Velocity Measurements; Field Data; Turbulence; Flow Characteristics